a heavy woman usually in her twenties who thinks she is hot, wears too tight of clothing and when she eats looks like a hog devouring slop.

for example if a woman walks by you in a bar and fits this description, you turn to your buddy and say wow look at that hog jaw, this usually results in her boyfriend who usually weighs 100lbs getting in your face, while his girlfriend eats all the bar peanuts. This is a prime example of HOG JAWS